My 18 year old son and I would like to spend a few days in the Coban area enjoying cave exploring, swimming, white water rafting. (Pools of Semu Champey, Lanquin caves, candeleria caverns) We are adventurous, but my husband wants us to be safe. Should we get on a tour? Our Guatemala vacation starts in Antigua then to Coban area, then to Peten/Tikal and back home to CA. How about transportation to Coban then to Tikal? I'd prefer to fly out to GC at end.